తెల్ల రక్తకణాలు

తెల్ల కణాలు లేదా తెల్ల రక్తకణాలు (White Cells or White Blood Cells) రక్తం లోని ఒక విధమైన కణాలు.

 తెల్లకణాల పట్టిక 
 Type  Microscopic Appearance  Diagram  Approx. %in adults<sup>  Diameter (μm)  Main targets  Nucleus  Granules  Lifetime Neutrophil 75px  75px  54-62%  10-12  
 bacteria
 fungi multilobed  fine, faintly pink  6 hours-few days(days in spleen and other tissue) Eosinophil    75px  1-6%  10-12  
 parasites
 in allergic reactions   bi-lobed  full of pink-orange (when stained)  8-12 days (circulate for 4-5 hours)  Basophil  75px  75px  <1%  12-15  
 in allergic reactions bi- or tri-lobed  large blue  ? Lymphocyte  75px  75px  25-33%  7-8  
 B cells: various pathogens
 T cells:
 Natural killer cells: virus-infected and tumor cells. deeply staining, eccentric  NK-cells and Cytotoxic (CD8+) T-cells  Semester 4 medical lectures at Uppsala University 2008 by Leif Jansson  weeks to years Monocyte   75px  2-8%  14-17  Monocytes migrate from the bloodstream to other tissues and differentiate into tissue resident macrophages or dendritic cells.  kidney shaped  none  hours-days Macrophage  75px  75px   21 (human)Environemental Health Perspectives 150(5), Sept. 1997 13 (rat)Environmental Health Perspectives 150(5), Sept. 1997 Phagocytosis (engulfment and digestion) of cellular debris and pathogens, and stimulation of lymphocytes and other immune cells that respond to the pathogen.   activated=days immature=months-years Dendritic cells75px  75px    Main function is as an antigen-presenting cell (APC) that activates T lymphocytes.   similar to macrophages

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